Well, I’m a big fan of “Whoops” pages, and Microsoft PhotoSynth’s site has a pretty cool one…
If you build Web sites, you should try to have a Whoops page in case anything goes wrong. It helps the user feel better about the site not working – much more so than a cryptic server error page or 404 “page not found” error.
Auri's Blog 
I agree entirely with your sentiments. and its even better if you can bring a smile to the users face!